elios115 -
Welcome aboard! Sorry no answer to your question -- I'd bet there are a number of folks that are familiar -- but there is a lot of traffic on the CNCZone - and maybe missed it? or, Maybe the question would better fit in the CAD Software discussion pages - but you could ask there and link to this I suppose. I was interested in the software so did a little looking too.
It appears that the formats CAD4 uses are DXF/DWG (from old website):
"Professional cartographic Raster to Vector conversion Import Export AutoCAD DXF and DWG files Image Acquire and Processing."
All the links I found were dead - and no downloads/ Bet you'll have to find a replacemnt for the fellow to use in his office setting. Wasn't too expensive -- listed at 99USD - so other similar options may be out there.
Good luck - happy hunting.
Cheers - Jim
Experience is the BEST Teacher. Is that why it usually arrives in a shower of sparks, flash of light, loud bang, a cloud of smoke, AND -- a BILL to pay? You usually get it -- just after you need it.